Avoid a buffer copy while replying to RPC requests.
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Key: HADOOP-4813
URL: https://issues.apache.org/jira/browse/HADOOP-4813
Project: Hadoop Core
Issue Type: Improvement
Components: ipc
Reporter: Raghu Angadi
RPC server first serializes RPC response to a ByteArrayOutputStream and then
creates a new array to write to socket. For most responses the RPC handler is
able to write the entire response in-line. If we could use the same buffer used
by ByteArrayOutputStream, we can avoid this copy.
As mentioned in HADOOP-4802, yet another copy could be avoided (in most cases)
if we use a static direct buffer for the responses (not proposed for this jira).
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